Physics (Theses and Dissertations): Recent submissions
Now showing items 321-340 of 458
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Magnetic Characteristics of Sunspot Groups and their Role in Producing Adverse Space Weather
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The energy that powers solar flares is known to come from magnetic energy stored in sunspot groups, but the precise conditions required and processes involved in energy release remain unclear. The likelihood of ... -
Laser-induced failure modes in plasmonic thin films
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)In order for the areal density of magnetic hard-drives to continue increasing, it is necessary to improve upon current recording technologies. The proposed next-generation magnetic recording process, heat-assisted magnetic ... -
Nanomechanical Label Free Micro RNA Detection For Cancer And Liver Injury Diagnosis
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)A biosensor is a device in which a biological component is coupled to a transducer which converts a biological recognition event into a detectable signal. Microribonucleic acid (miRNA, microRNA) are non protein coding ... -
Precision diagnostics of pulsation and evolution in helium-rich low-mass stars
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)In this thesis we discuss many types of low mass stars linked by their unusually low hydrogen atmospheric abundance, usually completely replaced with helium. We begin with the hot subdwarfs; subdwarf O and B (sdB, sdO) ... -
Carbon Nanomaterials for Improved Performance of Perovskite Solar Cells Processed under High Humidity
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The work documented in this thesis concerns optimization of stacks of semiconducting materials for photovoltaic purposes. Hybrid organic-inorganic metal halide perovskite (MHP) is a promising semiconducting material for ... -
The in-situ structural characterization of layered double hydroxide materials in catalytic and biological applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The overall aim of this PhD research is to understand the physical behaviours of layered double hydroxide (LDH) nanomaterials in applied environments. Two aspects of LDH-based applications were studied. Firstly, the thermal ... -
Inkjet Printed Energy Storage Systems for Electrochemical Testing and In-Situ TEM Analysis
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)Understanding of how materials store charge in supercapacitor and battery systems is fundamental to improving these classes of energy storage devices. While materials can be analysed and examined before they are incorporated ... -
Quasi-Periodic Pulsations in Solar Flares and the Earth's Ionosphere
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)Solar flares are the most powerful and energetic physical phenomena in our solar system, releasing radiation across the whole electromagnetic spectrum with total energies reaching on the order of 10^25 in a matter of ... -
Nanofabrication and electronic transport properties of silicon nanowires
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)This project develops a robust and reliable process to pattern sub 20 nm features in negative tone Hydrogen Silsesquioxane (HSQ) resist using high-resolution Electron Beam Lithography (EBL) and a low damage reactive ion ... -
A Microscopy Study of PVD Grown Cu: Sample preparation, optimisation and in-situ analysis
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)A variety of sample preparation techniques have been developed and optimised for PVD grown Cu films and Cu NWs. These techniques include traditional cross-sectional preparation, plan-view preparation, site-specific ... -
Transport Properties of Disordered Nanowire Networks: from Conducting Thin Films to Neuromorphic Applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Nanowire networks have had much attention from the scientific community in the past two decades due to their potential in numerous technological applications. Central to these are the superior electrical properties manifested ... -
Surface studies of magnetite (100)
(Trinity College (Dublin, Ireland). School of Physics, 2000)The (100) surface of magnetite (Fe3 O4 ) has been studied using scanning tunneling microscopy (STM) in ultra high vacuum (UHV) with a view to establishing a test surface for spin polarised STM experiments. Two ... -
A search for X-ray flares in the nuclei of galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2003)Observations of the giant elliptical galaxy NCG 4552 at ultraviolet wavelengths during the early 1990’s showed sharply peaked emission within ~2pc of its centre which initially brightened and then faded. The features of ... -
Ultrafast non-linear optics for telecommunication applications
(Trinity College (Dublin, Ireland). School of Physics, 2003)The aim of the research done for this thesis was to characterise the properties of a fibre laser producing ultrashort pulses at the telecommunication wavelength of 1550nm. We also measured the nonlinear optical properties ... -
Preparation, characterisation and technological applications of half-metallic ferromagnetic oxides in ceramic and thin film form
(Trinity College (Dublin, Ireland). School of Physics, 2001)The aims of this study were: (i) to study the structural, magnetic and transport properties of ferromagnetic oxides (La0.7 Sr0.3)MnO3 and A2FeMoO6 (A=Ca, Sr, Ba) in polycrystalline and thin film form, (ii) to optimise the ... -
The weakly coupled chiral Schwinger model on a finite lattice
(Trinity College (Dublin, Ireland). School of Physics, 2000)The primary aim of this work is the development of a perturbative analysis of the phase structure of the lattice Schwinger model. A novel method for implementing this analysis is presented. It is shown analytically that ... -
Numerical and experimental investigation of a novel waveguide design for use in high power laser diode devices
(Trinity College (Dublin, Ireland). School of Physics, 2002)Because of their efficiency, small size and reliability high power laser diodes are used for numerous tasks, such as the pumping of solid state lasers, second harmonic generation and the pumping of rare earth fibre ... -
Curing of complex monomer systems: a spectroscopic and thermal analysis
(Trinity College (Dublin, Ireland). School of Physics, 2001)This thesis describcs the development of a novel methodology, which uses the high resolution liquid nuclear magnetic resonance (NMR) spectroscopic technique to continuously monitor in real time the thermal and UV-photoinitiated ... -
Supersymmetric noether currents and Seiberg-Witten theory
(Trinity College (Dublin, Ireland). School of Physics, 2000)This thesis has been devoted to the construction of the Noether supercharges for the Seiberg-Witten (SW) model. One of our most important results is the first complete and direct derivation of the SW version of the ... -
Printed Electronics from Solution-Processed 2D Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The fervour created in the wake of the graphene gold-rush has fuelled investigative momentum over the last decade. The maturity of liquid-phase processing has meant that solution-processed layered crystals can be now be ...
